Improvement in wrought-iron columns



@anni ditta,

JOHN'W. MURPHY, 0F PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 110,154, dated December 13, 1870.

IMPROVEMENTN. wRouGHT-IRON coLuMNs.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern Be it known that I, JOHN W. MUnPHYfof the city of Philadelphia, in the State ot' Pennsylvania,

have invented certain new and useful Improvements.. in Wrought-Iron or Steel vColumns or Posts for Figure 1 represents, in perspective, a portion of a shaft or hollow column constructed after my plan.`

Figure -2 represents a cross-section through the same. i

' I am aware that rnany forms of wrought-iron or steel 'coluinns,'shafts, and posts have been designed, and thatsegments and ribs have been combined so as to forma column. I also use segments and ribs; but thelatter are of peculiar construction, from which I gain important results in 'the strength of the column, and in its lightness and cheapness ot' construction.

My invention consists in constructing a wroughtiron or steelcolumn, shaft, or post, by the combination of a series-of' segmental plates .i and a series of X-fornied` or yfour-flanged ribs, bolted or riveted together, as will be explained.

. To enable others skilled in the art to make and use my invention I will proceed to describe the same with reference to the drawing:

The plates A lare plain rolled plates and segments of a cylinder' if the column is to be round; and dat, plain-surfaced or waved or corrugated if it is to be a the finished colunn and the rib as a whole adds such strength to the column as is 'due to their distance from the center thereofwit-hout the increased weight that would be due to a column of the extreme diameter of the outerportionsl of the ribs;or, in other words, as the strength of a column is as to its diam` eter, my object is to increase that diameter for strength without actually making a 'full cylinder, which would a ld great Iweight to the structure.

It will be perceived -that the flange a projects slightly inside ot. the inner perimeter of the column, and it can be extended in that direction any distance within the limits ot' the opening in the column.

The 'langes c d being ou the exterior of the cylinder or column practically add that much to the diameter of said cylinder.

The iiangesb` extending far beyondthe flanges c d and the cylinder, too, add further to the diameter of said-cylinder, so that I get a column of the capacity ldue to a diameter extending from extreme to extreme of the anges 11, while, as'to Weight, the cylinder falls far short of that diameter. It has the strength of a great diameter, but the weight ot' a diameter much less in extent. l

Th'e anges c d ou the exterior of the cylinder', and extending on bot-l1 sides of the joints between the plates and ribs, add very material, strength to the structure.

Having thus fully described my invention,

In the construction of a wroughtiiron or steel column, shaft, or post, the combination-of the series of plates A and the series of X-formed or four-flanged ribs B, placed and riveted together, as herein described and represented.

' JOHN NV. MURPHY.

Witnesses:

'Osuna R. MEYERS,

F. W. Gn'iz. 

